The rush of new iPad with Wi-Fi + 3G owners looking to activate their devices has brought down the activation server of Vodafone UK. Macworld UK reports that a Vodafone call center said “the server has now been down for a couple of hours” and that the company currently can’t activate any Micro SIM devices. Both Vodafone and Orange in the UK require iPad users to call in for activation, while O2 customers can activate their service…